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Updated Bn128PairingImpl to use optimized batch pairing #10765

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Jun 20, 2019
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Updated Bn128PairingImpl to use optimized batch pairing #10765

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70452c9
Bn128PairingImpl uses pairing_batch method in bn
zac-williamson May 3, 2019
46532cb
updated Cargo.lock
zac-williamson Jun 10, 2019
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4 changes: 3 additions & 1 deletion Cargo.lock
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4 changes: 2 additions & 2 deletions ethcore/src/builtin.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -498,7 +498,7 @@ impl Impl for Bn128PairingImpl {

impl Bn128PairingImpl {
fn execute_with_error(&self, input: &[u8], output: &mut BytesRef) -> Result<(), Error> {
use bn::{AffineG1, AffineG2, Fq, Fq2, pairing, G1, G2, Gt, Group};
use bn::{AffineG1, AffineG2, Fq, Fq2, pairing_batch, G1, G2, Gt, Group};

let elements = input.len() / 192; // (a, b_a, b_b - each 64-byte affine coordinates)
let ret_val = if input.len() == 0 {
Expand Down Expand Up @@ -539,7 +539,7 @@ impl Bn128PairingImpl {
vals.push((a, b));
};

let mul = vals.into_iter().fold(Gt::one(), |s, (a, b)| s * pairing(a, b));
let mul = pairing_batch(&vals);

if mul == Gt::one() {
U256::one()
Expand Down